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#include "PasswordHelper.hxx"

#include <rtl/digest.h>
#include <tools/string.hxx>

using namespace com::sun::star;

namespace binfilter
{

void SvPasswordHelper::GetHashPassword(uno::Sequence<sal_Int8>& rPassHash, const sal_Char* pPass, sal_uInt32 nLen)
{
    rPassHash.realloc(RTL_DIGEST_LENGTH_SHA1);

    rtlDigestError aError = rtl_digest_SHA1 (pPass, nLen, reinterpret_cast<sal_uInt8*>(rPassHash.getArray()), rPassHash.getLength());
    if (aError != rtl_Digest_E_None)
    {
        rPassHash.realloc(0);
    }
}

void SvPasswordHelper::GetHashPasswordLittleEndian(uno::Sequence<sal_Int8>& rPassHash, const String& sPass)
{
    xub_StrLen nSize(sPass.Len());
    sal_Char* pCharBuffer = new sal_Char[nSize * sizeof(sal_Unicode)];

    for (xub_StrLen i = 0; i < nSize; ++i)
    {
        sal_Unicode ch(sPass.GetChar(i));
        pCharBuffer[2 * i] = static_cast< sal_Char >(ch & 0xFF);
        pCharBuffer[2 * i + 1] = static_cast< sal_Char >(ch >> 8);
    }

    GetHashPassword(rPassHash, pCharBuffer, nSize * sizeof(sal_Unicode));

    delete[] pCharBuffer;
}

void SvPasswordHelper::GetHashPasswordBigEndian(uno::Sequence<sal_Int8>& rPassHash, const String& sPass)
{
    xub_StrLen nSize(sPass.Len());
    sal_Char* pCharBuffer = new sal_Char[nSize * sizeof(sal_Unicode)];

    for (xub_StrLen i = 0; i < nSize; ++i)
    {
        sal_Unicode ch(sPass.GetChar(i));
        pCharBuffer[2 * i] = static_cast< sal_Char >(ch >> 8);
        pCharBuffer[2 * i + 1] = static_cast< sal_Char >(ch & 0xFF);
    }

    GetHashPassword(rPassHash, pCharBuffer, nSize * sizeof(sal_Unicode));

    delete[] pCharBuffer;
}

void SvPasswordHelper::GetHashPassword(uno::Sequence<sal_Int8>& rPassHash, const String& sPass)
{
    GetHashPasswordLittleEndian(rPassHash, sPass);
}

bool SvPasswordHelper::CompareHashPassword(const uno::Sequence<sal_Int8>& rOldPassHash, const String& sNewPass)
{
    bool bResult = false;

    uno::Sequence<sal_Int8> aNewPass(RTL_DIGEST_LENGTH_SHA1);
    GetHashPasswordLittleEndian(aNewPass, sNewPass);
    if (aNewPass == rOldPassHash)
        bResult = true;
    else
    {
        GetHashPasswordBigEndian(aNewPass, sNewPass);
        bResult = (aNewPass == rOldPassHash);
    }

    return bResult;
}

}

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